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Power - Beam (NOT sweep) ·BeamPower

8417

Glass-octal beam-power output tube designed for high-fidelity, high-power sound systems and demanding audio-frequency amplifier output stages.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
1
Base
8LY
Socket code
IO
Base pins
8
Nominal heater
6.3 V / 1.6 A

Description

Glass-octal beam-power output tube for high-fidelity, high-power sound systems.

Socket description

International Octal

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base
8LY
Socket code
IO
Base pins
8
Nominal heater voltage
6.3 V
Nominal heater current
1.6 A
Parallel heater voltage
-
Parallel heater current
-
Series capable
No

8LY - Terminal pinout

Electrical assignments shared by every tube using this base designation.

No verified pinout is recorded for this base designation.

Section ratings

1 physical section, each with unique specifications.

Section 1

Beam Power

X-ray radiationInterelectrode capacitances
Plate resistance
16000 Ω
Transconductance
0.023 S
Amplification factor
16.5
Max plate voltage
680 V
Max screen voltage
500 V
Max plate dissipation
35 W
Max screen dissipation
5 W
Max cathode current
200 mA

Published electrical limits and characteristics promoted from the approved source; non-schema quantities are retained in TUBE_SECTION_PARAMETER.

Source-dependent data

Operating conditions by source

Each block preserves the test conditions and published values from one reference. Values from different sources are intentionally kept separate.

Data set 01

1947 Westinghouse

Published operating points and test conditions from this source.

SECTION 1

Beam Power

Other

  • HeaterVoltageNominal

    6.3 V

    Nominal

  • HeaterCurrentNominal

    1.6 A

    Nominal

  • MaximumPlateOrOperatingVoltage

    680 V

  • Maximum Screen Voltage

    500 V

  • Maximum Plate Dissipation

    35 W

  • Maximum Screen Dissipation

    5 W

  • Maximum Cathode Current

    200 mA

Characteristic

  • Transconductance

    23000 µS

    Typical

  • Amplification Factor

    165

    Typical

  • Plate Resistance

    16000 ohm

    Typical

  • Maximum Signal Power Output

    100 W

    PushPull ClassAB1 pentode connection; two tubes

Data set 02

1950 Sylvania

Published operating points and test conditions from this source.

SECTION 1

Beam Power

Characteristic

  • Plate Resistance

    16000 ohm

  • Transconductance

    23000 µS

  • Amplification Factor

    16.5

Other

  • Maximum Plate Voltage

    660 V

  • Maximum Screen Voltage

    500 V

  • Maximum Plate Dissipation

    35 W

  • Maximum Screen Dissipation

    5 W

  • Maximum Cathode Current

    200 mA

  • Plate Voltage

    300 V

  • Screen Voltage

    300 V

  • Plate Current

    100 mA

  • Maximum Signal Power Output

    70 W

    ClassAB,UltraLinear,PushPull,TwoTubes

Data set 03

1965 Sylvania Electronic Tubes Vol3

Published operating points and test conditions from this source.

SECTION 1

Beam Power

Characteristic

  • Heater Voltage

    6.3 V

  • Heater Current

    1.6 A

  • Grid To Plate Capacitance

    0.9 pF

  • Input Capacitance

    22 pF

  • Output Capacitance

    9 pF

  • Plate Voltage

    300 V

  • Screen Voltage

    300 V

  • Grid Voltage

    -12 V

  • Plate Current

    100 mA

  • Screen Current

    5.5 mA

  • Transconductance

    23000 uS

  • Plate Resistance

    16000 ohm

  • Amplification Factor

    16.5

  • Grid Cutoff Voltage

    -37 V

Other

  • Power Output

    70 W

    TwoTubes;PushPull;ClassAB;UltraLinear;PlateSupply=455V

  • Power Output

    100 W

    TwoTubes;PushPull;ClassAB;Pentode;PlateSupply=560V

Data set 04

1975 RCA RC30

Published operating points and test conditions from this source.

SECTION 1

Beam Power

Other

  • Cathode Current

    200 mA

    Published in approved 8417 target datasheet entry; Section1

  • Plate Dissipation"

    35 W

    Published in approved 8417 target datasheet entry; Section1

  • Plate Voltage

    300 V

    Published in approved 8417 target datasheet entry; Section1

  • Grid-No.2 Voltage

    300 V

    Published in approved 8417 target datasheet entry; Section1

  • Grid-No.l Voltage for plate current of

    1 mA

    Published in approved 8417 target datasheet entry; Section1

  • For fixed-bias operation

    1 MΩ

    Published in approved 8417 target datasheet entry; Section1

  • For cathode-bias operation

    0.25 MΩ

    Published in approved 8417 target datasheet entry; Section1

  • Plate Supply Voltage 400

    560 V

    Published in approved 8417 target datasheet entry; Section1

  • Grid-No.2 Supply Voltage 275

    300 V

    Published in approved 8417 target datasheet entry; Section1

  • Zero-Signal Plate Current 150

    100 mA

    Published in approved 8417 target datasheet entry; Section1

  • Maximum-Signal Plate Current 294

    270 mA

    Published in approved 8417 target datasheet entry; Section1

  • Zero-Signal Grid-No.2 Current 4.4

    3.4 mA

    Published in approved 8417 target datasheet entry; Section1

  • Maximum-Signal Grid-No.2 Current 34

    31 mA

    Published in approved 8417 target datasheet entry; Section1

  • Effective 2800

    4200 Ω

    Published in approved 8417 target datasheet entry; Section1

  • TotalHarmonic Distortion 2.5

    2 %

    Published in approved 8417 target datasheet entry; Section1

  • Maximum Signal Power Output 65

    100 W

    Published in approved 8417 target datasheet entry; Section1

  • * Grid-No.2 may reach

    8 W

    Published in approved 8417 target datasheet entry; Section1

Characteristic

  • Plate Resistance

    16000 Ω

    Published in approved 8417 target datasheet entry; Section1

  • Transconductance

    23000 µS

    Published in approved 8417 target datasheet entry; Section1

  • Plate Current

    100 mA

    Published in approved 8417 target datasheet entry; Section1

  • Grid-No.2 Current

    5.5 mA

    Published in approved 8417 target datasheet entry; Section1